Honing tool



2 Sheets-Sheet l INVENTOR. MAURICE N.PRANGE ATTORNEYS Nov.23', 1943. M. N. PRANGE HONING TOOL Filed April 13, 1942 I 1' n H I 'BYQWI AW! NOV. 23, 1943. M PRANGE 2,334,838

' HONING TOQL v FiledApril'lS', 1942 2 Sheets-Shee't 2 MAURICE NPRANGE Patented Nov. 23, 1943 7 ,omrso :STATES PATENT:{"O F- FICE passing Toot/ a i v I a rice-signingsmed c ia; f y 1 Application April 1-3,'1942, Serial No;438,593 1 V i "7Claiins."(01(51Q184i4) I This invention relates generally to honing or lapping tools and refers"more particularly to tools of this type having a plurality'of circumferentially spaced abrasive" elements support "for radial Jad-V justment either inwardlyor outwardlyrelative to j the axis of the tool.

One of the principal-objectsofthis invention' is to improve the adjusting means for the abrasive elements so as to enable the diameter. of the tool to be varied throughout a wide'range oftravel and, I

atthe same'time, permit ad'justrnentof the abra- V sive elements to within veryclose limits ofxapreselected-diameter in the .range of adjustment of thetol.- ..v v

Another object of this invention is'to provide adjusting means for the .abrasiverelements which is not only simple and compact lin construction,

but which is also capable of beinglocated for convenient manipulation by the operator.

A further object of this invention is tonsub stantially increase the wear Jandlperformance of the abrasive'elements by providing-each .element with a backing' formed-oflamaterial carefully se lected to control the wear of the abrasive elements during operation ofthe tool;

A'iurther object of this invention is .to provide a driving connection-between the cage of the hone and the drive shaft which permits the cage to float to some extent and align'itseliwith the bore beinghoned. i t

The'foregoing, as well as lotherlobjects, will be made more "apparentlasthis description proceeds, especially when considered in connection withthe accompanying drawings, wherein: t

Figure l'is aside elevational view of a'honing tool constructedin accordance with this invention; 7 i l j Figure 2 is :a longitudinal sectionalyiew taken on the line 2- -2.of Figurezl;

Figure 3 is a cross sectionalview takenonthe line 3-3 of Figure 2; j. i v a Figure 4 is across sectional viewtakenom the line 4-4 ofFigure2;, 1

Figure 5 is a-crosssectionalview taken on the 7 line 5+5 of Figure 2; r V V t Figure :6 isa cross sectional View through one of the abrasive elements andtheassociated supporting structure; a

Figure 7 is a cross sectional viewtaken .onthe Figure 8 is a detail elevational view of; one of the stone holder-stand Figure 9 is a'sectional view takenon the'line closed by suitable heads I l and [5 which prefsameto belreadily disassembled. v

'erably'threadedly engage thecage .toenableathe The abrasive elements 1.3 are adjustable dially with respect to the axis of rotation of the j cage 1 and. for accomplishing this result apair of scrolls .16 and ll arezrespectively rotatably supported'on the cageat oppositeendslof the holders l2. The inner S111f30850f1l3h scrolls arepr'ovided with helical teethandithese teeth respec- 'tively engage corresponding teeth formed on 01)- posite ends of the holders; The arrangement is suchthat rotation of the scrolls in one 'direction moves the holders .12 radially outwardly with-respect to the cage and rotation of theiscrollsin the opposite direction moves the holders l2 radially inwardly relative to thecage. This adjustment of the .abrasive'elements I3 is accomplished by the .means to be presently described and is important because it enables adjusting the toolto various difierent diameters.

*The cage Ill is rotated byia head it comprising *principallytwoparts Iii-and 2th The part It is formed with aniahnular flange 21 concentric with the axis'of rotation v of the head and sthreadedfor deta'chableengagement with the part 20. The

part 20: isrprovided with atapered spindle 22 adapted to engage a suitable driving mechanism notshown herein. i The part. I79 isalso provided with a hub 23 adapted to telescopically ireceive one endt'of a torque transmitting tube 24 'andlseoured :to :the

tubefl' l by means-of the fastener elementsj2i5. Theo'pposite end .of the tube 26 is internally threaded for detachable :connection with a cou- 'pling sleeveifi adapted torproject into a hub -2-] formedon the headltlof theocage It. ,Upon reie'rence to Figure 4 it will be J noted that a plurality of pins28 project radiallyoutwardlyfrom the coupling sleeve 26 inspacedgrelation to "each other circumferentiallyo-f the sleeve 26 and,respectively, project into:1ongitudinally extending slots 29 'formedin thelhub 2T. The-slots29 open through the free end of lth hub 21' to enable the pins28 to-be'readily inserted intothe same and accidental disengagement ,of the pins from the slots 29 is preventedbya sleeve L30. The sleeve OPFigureiii: V l g q is slidably mounted onithe coupling :it. and The lapping or honing tool slectewhereih for threadilyengagestheinneresurfaceoflthehub lil.

a connection with the head. I8.

then rotated either clockwise orQcounterclocka,

-means conveniently accessible for;manipul ation n the driving head for the tool. 7

Upon reference to Figure 2 it'will be noted t hat a sleeve .H surrounds the annular flange 21 on V the head in concentric relation to the a xis of ;rotation of the head and this sleeve is formed with an internal helical tooth 32. l One end of the sleeve is rotatably supported on the part l9 of the head and the opposite end of' the'sleev'e operating teeth on a collar 34 which; in turn, is

V V splined on the part for sliding'movementrelative to the head towardand away from-the sleeve '31. The collar 34 is normafly urged in a three: tion'toward the sleeve 3| by a spring35'and,

accordingly,- the sleeve 3| normally rotates as a unit with the driving head l8. o r

The sleeve 3| is-connected to' the scrolls l6 and l! by reduction gearing 3B suitably supported on the driving headilB withintheconfines of the annularflflange 2|. In detail, a bracket 31 is secured to the part I9 of the drivtates the scrolls l6 and n to radially adjust the abrasive elements l3 relative to the cage [0. The

above adjusting mechanismenables the diam-- eter of the tool to be varied throughout a wide range of travel and, owing to the nature of the reduction mechanism 36, permits adjusting the abrasive members to within very close limits of" any preselected diameter in the range of adjustment of the tool. Moreover, the sleeve 3| for efi'ecting the desired adjustment is readilyrac cessible by the operator and, 'acc'ordingly, the adjustment may be made with the minimum loss 1 ,of time. In addition, it will be noted that the x I construction of the tooland associated driving mechanism is such as to enable theparts to be readily assembled and disassembled.

'Referringfnow more particularly to Figure .sofethe' drawingsiit will be noted that the abrais provided with teeth 33 normally engaging cosive elements l3 are each provided with a back-, ing 50 in the form of a flat strip of material having different wearing characteristics than the abrasive element. Theibackingfstrip 50 may be abrasive elements and not onlyminimizes chip-' ping'and breaking of the abrasive elements but 7 illSOlIl'lpIOVGS thesfinish of the surface of the ing'headl8 within theannular flange 2|-and' this bracket supports a shaft 38 for rotation about an axis laterally offset from and extending substantiallyperpendicular.to the axisloii rota L tion of the driving head 18." A pair of'gears 39 are-respectively secured to opposite. ends of the shaft'38 andextend through adjacent slots in the annular flange 2i for meshing engagement with the helical'tooth 32' on the inner surface 'of the sleeve 3|. 1 7

Upon reference to Figure 3. it will be. noted that a worm '40 is secured to theshaft 38 between the bevel gears 39 and'meshes with a worm gear 4| iwhich, in turn, is secured to a-stub shaft 42 j supported on the bracket 3'! for rotation about an axis coincidentwith the axis of rotation of the head. It-follows'from the above that rota- 'tion of the sleeve 3l 'in opposite directionsefiects at 'corresponding rotation'of. the st-ub shaft 42 One end of the stub shaft projects "int'O the tube 2 4 andis preferablypolygonallyoshaped as "through the medium of the reduction gearing 35.

within a correspondingly shaped bore formed in 'a coupling 46, with the'result; that the couplin is rotated as a unitwith-thestub shaft-42. The

coupling dd is pinned or, otherwise;secured;to

one end of a shaft 45 havingnthe opposite end detachably secured-to a shafted; Theshaoft-qfi "extends axially through the'fcage H3 and is- 'secured to both of the scrolls lBandlEk; v

' Referring now to the operation. lithe adjust ing mechanism, itwill-behoted that when;the operator desiresto vary the diameterof the tool the-collar 34 is moved againstthe action of the spring 35 to release the sleeve 3! 'froniits driving The. sleeve 5,! ,is

Wise depending on whether itois desired toincreaseor decrease the diameter of the'toolqgRotation of the sleeve 3| impartssa rotativermoveent .inst ancecthe strip is secured on forming face of the latter element.

the leading side of the abrasive element andone longitudinal edge of the stripis arranged substantially flush with thework performing surface on the abrasive element.

i For the purpose: of convenience in installation of the abrasive elements and associated backing strips, both of. theo latter are preferably secured in a'channelshaped .slieet metal clip 5lr The abrasive elements areprefe'rably oeme'nted'in their respective clipsv and the latter are adapted v to fit in the holders lilofor the abrasiveelements.

' Although any-suitable'means may be'provided for clamping the clips .5]. to their respective holdersfl2,'.nevertheless,,I have shown in Figures 8 and 9 a preferred construction-foraccomplishr ing thisresult; In detail; each stoneholder. 5|.

i has a pair-of lugs 52.,respectively secured to;0p'- V posite endsiof the base-portion of the clip. i- The lugs 52 projectinto slots 53" formed inthe adjacent ends of the associatedstone'holder and are threaded for receiving clampinglscrews 54." The inner ends of the clamping screws fit respectively abut the adjacent "ends .of the-stone holders [2 and frictionally hold the clips in What'I'cIaim as my invention is 1 1. In a tool of the class described, a revolvable place;

supporting member, abrasive elements mounted on said supporting memberLin spaced relation' to f-each other circumferentially of the member for movement radially of the axis of said "member,

wm'eansrfor adjusting the abrasive elements radi-- ally with respect to the .axis of rotation ,ofrthe supporting member including a revolvable shaft having aworm gear thereon, asecond revolvable shaft supported with its axiswextendingltransjzv r e t h axis o th firs sha t d havi a worm meshing with the; worrn ;gear; a toothed h e r d t hg e d ha a rotata sleeve supported in concentricrelation to ,the

- iirst shaft; and having an internal helical tooth 1 meshing with the teeth on said wheel for driving the first shaft in opposite directions upon rotation of the sleeve in opposite directions, and means connecting the first shaft to the abrasive elements for adjusting the latter radially of the supporting member. s

2. In a tool of the class described, a revolvable supporting member, abrasive elements mounted on the supporting member in spaced relation to each other circumferentially of the member for movement radially of the axis of said member, means for driving the supporting member including a revolvable head having an annular portion concentric with the axis of rotation of the head and having a slot through the annular portion, a revolvable shaft supported on the head in axial alignment with the axis of rotation of the head and projecting into the annular portion, a toothed wheel also rotatably supported on the head in the annular portion thereof and projecting through the slot in said annular portion, a sleeve surrounding the annular portion and having an internal helical tooth meshing with the teeth on said Wheel for rotating the wheel in opposite directions upon rotation of the sleeve relative to the head in opposite directions, means operatively connecting the toothed wheel to said shaft for rotating the latter, and means operatively connecting the shaft to the abrasive elements for adjusting the latter radially of the supporting member.

3. In a tool of the class described, a revolvable supporting member, abrasive members mounted on the supporting member in spaced relation to each other circumferentially of the member for movement radially of the axis of the member, means for rotating the supporting member including a revolvable head having an annular portion concentric with the axis of rotation of the head and having a slot through the annular portion, a shaft supported on the head in axial alignment with the axis of rotation of the head and projecting into the annular portion of the head, a worm gear secured to the shaft within the annular portion of the head, a second shaft supported on the head in the annular portion of the latter and having a worm meshing with the worm gear, a toothed wheel secured to the second shaft and projecting through a slot in the annular portion of the head, a sleeve supported on the annular portion of the head for rotation relative thereto and having an internal helical tooth meshing with the teeth on the toothed wheel for rotating the first named shaft in opposite directions upon rotation of the sleeve relative to the head in opposite directions, and means operatively connecting the first named shaft to the abrasive elements for adjusting the latter radially with respect to the supporting member.

4. In a tool of the class described, a revolvable supporting member, abrasive elements mounted on said member in spaced relation to each other circumferentially of the member for movement radially of the axis of said member, means for driving the supporting member including a revolvable head having an annular portion concentric With the axis of rotation of the head and having circumferentially spaced slots through the annular portion, a shaft supported on the head in axial alignment with the axis of rotation of the head and projecting into the annular portion, a worm gear secured to the end of the shaft in the annular portion, a second shaft having a worm meshing with the worm gear, a pair of toothed wheels secured to the second shaft and respectively extending through the slots in the annular portion of the head, a revolvable sleeve surrounding the annular portion and having a helical internal tooth meshing with the toothed wheels on the second shaft, means connecting the sleeve to the head for rotating the sleeve as a unit with the head and releasable to permit rotation of the sleeve relative to said head, and means connecting the first named shaft to the abrasive elements for radially adjusting said elements relative to the supporting member upon rotation of the first named shaft in opposite directions.

5. In a tool of the class described, an elongated abrasive element having a work performing surface and a flat strip of fibrous backing material extending for substantially the full length of the abrasive element and cemented to a side of said element adjacent the Work performing surface with one longitudinal edge substantially flush with the work performing surface of the abrasive element.

6. In a tool of the class described, an elongated clip substantially channel shaped in cross section and having an abrasive element therein, a holder having a channel for receiving the clip, a pair of lugs respectively secured to opposite ends of the base portion of the clip and projecting through slots in the base portion of the channel in the holder, and clamping screws threadedly engaging the lugs and respectively engageable with opposite ends of the holder to clamp the clips in assembled relation with the holder.

7. In a tool of the class described, an elongated clip substantially channel shaped in cross section and having an abrasive element therein, a holder for the clip, a pair of lugs respectively projecting from opposite ends of the clip through registering slots in the holder, and releasable clamping elements respectively carried by the lugs and engageable with adjacent portions of the holder to removably secure the clips in assembled relation with the holder.

MAURICE N. PRANGE. 

